Your facts are lacking a whole lot of substance when you are unable to mention even one visa a agent could legally sort out outside of the ones already mentioned.
Now, I don't know the exact numbers on his financial situation, but I trust his confidence when he says he's got enough to get by while here.
His only options are being repeated in this post.
ED and DTV, with some sprinkle of MTV mentions. And then it is up to him to do research on which one fits the bill for him. I see Elite mentioned too, but that is a total waste for someone just wanting to test the waters.
Doing further research based on the comments on this post is not magic.
And a agent can't really give him any other legal options.